IRIX 11mm f/4 Blackstone

Irix 11mm f/4 Blackstone

Lens Summary

Brand: Irix

Also Known As: Irix 11mm f/4

Lens Type: Prime Lens

Format: Full Frame / FX

Focus: Manual Focus

Lens Mount: Canon EF, Nikon F, Pentax K

Release Date: 2017-03-02

MSRP Price: $774.95

Made in: South Korea

Production Status: In Production

Lens Description: Distinguished by its refined physical construction, the 11mm f/4 Blackstone Lens from Irix is an ultra-wide prime designed for Nikon F-mount DSLRs. As a rectilinear lens, the advanced optical layout makes use of aspherical, extra-low dispersion, and high-refractive index elements to control distortion and aberrations for accurate, and sharp rendering with a high degree of clarity and color accuracy. Additionally, a Neutrino coating has also been applied to the lens to control flare and ghosting for improved contrast when working in strong lighting conditions.

Photography Life Review Summary: Anybody buying this lens should know that this is a manual-focus-only lens. In this ultra-wide spectrum, it is not such a problem – Irix offers a well-designed manual focus ring with hyperfocal scale, focus lock and focus snap at infinity. The Irix 11mm f/4 is a lens for rather special purposes and I do not recommend starting with it to anyone who has not photographed with an ultra wide-angle lens yet. Creative and advanced photographers looking for new tools and perspectives may feel attracted to this lens though, so I would certainly recommend them to look into this offering from Irix. Read the full IRIX 11mm f/4 Blackstone Review by Photography Life.

IRIX 11mm f/4 Blackstone Specifications

Lens Specifications
Lens TypePrime Lens
Focal Length11mm
Mount TypeCanon EF, Nikon F, Pentax K
FormatFull Frame / FX
Compatible Format(s)Full Frame / APS-C
Compatible with TeleconvertersNo
Image StabilizationNo
Aperture Information
Aperture RingNo
Maximim Aperturef/4
Minimum Aperturef/22
Maximum Angle of View (Full frame or larger format)126°
Optical Information
Lens Elements16
Lens Groups10
Diaphragm Blades9 (Rounded)
Extra-Low Dispersion Glass Elements2
Special Glass ElementsFour HR Elements
Aspherical Elements3
Nano CoatingYes
Focus Information
FocusManual Focus
Built-in Focus MotorNo
Minimum Focus Distance10.83" (27.5 cm)
Filter Information
Filter SizeN/A
Accepts Filter TypeN/A
Physical Characteristics
Weather / Dust SealingYes
Mount MaterialMetal
Dimensions4.65 x 4.06" (118 x 103 mm)
Weight1.74 lb (790 g)
Other Information
Available in ColorsBlack

Lens Construction

Irix 11mm f/4 Lens Construction

MTF Chart

Irix 11mm f/4 MTF Chart


Irix 11mm f/4 Distortion

Sample Images

Irix 11mm f4 Image Sample (25) Irix 11mm f4 Image Sample (19) Irix 11mm f4 Image Sample (18)

Irix 11mm f4 Image Sample (1) Irix 11mm f4 Image Sample (21) Irix 11mm f4 Image Sample (23)


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